Design of non-binary quasi-cyclic LDPC codes by absorbing set removal
Behzad Amiri, Jorge Arturo Flores Castro, Lara Dolecek · 2014
Non-binary quasi-cyclic (NB-QC) codes are a class of graph-based codes with high performance and implementation-friendly structure. In this paper, we introduce a new method for designing NB-QC codes with improved performance in the low error-rate region. Specifically, we propose a construction which reduces the number of non-binary absorbing sets, which are known to cause errors when decoding non-binary LDPC codes. Our construction is based on a careful selection of the code design parameters. Simulation results demonstrate the superior performance of codes designed according to our technique compared to existing state-of-the-art NB-QC codes.